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US 2005/0031010 A1Published application
Anti-reflective (AR) coating for high index gain media
AssigneeIntel Corporation
InventorMark McDonald
Life of this patent
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Abstract
Anti-reflective coatings may be used on laser high index gain media to mitigate reflection. An absentee layer may be used to compliment the antireflective coating to improve its antireflective performance over a broader range of wavelengths. The absentee layer comprises a material having a higher index of refraction than that of the gain media and has a thickness corresponding to multiple halfwave thicknesses related to the center wavelength output by the laser.
Claims22
An optical coating, comprising:
- at least one anti-reflective layer having an admittance between that of a gain media and an adjacent media;
- an absentee layer having an index of refraction greater than said gain media and having a thickness corresponding to a number of half waves.
A method to mitigate reflection, comprising:
- applying an absentee layer having a thickness corresponding to a number of half wave thicknesses to an optical media, said absentee layer having an index of refraction greater than that of said optical media;
- and
- applying an antireflective layer comprising at least one material having an admittance between that of said optical media and an adjacent media.
A laser comprising:
- a tunable gain media to output a range of wavelengths around a center wavelength λ;
- at least one anti-reflective layer having an admittance between that of said gain media and an adjacent media;
- an absentee layer having an index of refraction greater than that of said gain media, said absentee layer having a thickness d determined as:
- d
- =
- m
-
-
- λ
- 2
-
- n
- where d is the thickness of said absentee layer, λ is the center wavelength to be output by the gain media, n is the refractive index of the absentee layer, and m is an integer number of half-waves selected to optimize performance of said antireflective layer over said range of wavelengths.
10 more elements
Dependencies are inferred from the claim text.